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ABSTRACT: To determine the nutritional requirements of TSAA for semi-heavy laying hens estimated by regression models and LRP (linear response plateau).288 semi-heavy laying hens distributed in six treatments were fed from week 22 to week 38 with a basic diet containing 14.4% crude protein to which levels of DL-methionine was added (0.00; 0.05;0.10; 0.15; 0.20; and 0.25) in order to obtain treatments with 0.484, 0.534, 0.584, 0.634, 0.684, and 0.734% TSAA contents. Theincrease in the level of TSAA in the diet from 0.484 to 0.734% showeda quadratic effect on egg production, egg weight, egg mass, and feed conversion. A linear effect on the internal quality of the egg was also observed when measuring theHaugh units and the albumen index. Using single-slope, broken line methodology, the minimal levels of TSAA which maximized egg production, weight, and mass, and showed the best feed conversion were 6.72, 6.68, 6.72, and 6.82 g/kg of food respectively. In summary, the increase of TSAA using synthetic methionine significantly improved performance of eggs laying hens. Because of this reason semi-heavy egg laying hens required 6,735 g TSAA/kg of foodor 775 mg TSAA per hen daily from 22 to 38 weeksof age (with daily feed consumption of 115 g).
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